On 12 February 2013 02:36, Pete Matos <[email protected]> wrote: > I want to end up with an estop circuit that will kill power to > everything in the machine except the computer in case of an emergency
On my machine I have taken the PC/controller/24V power from upstream of the main contactor. The e-stop loop then runs through the e-stop switches NC contacts and a channel of the 7i64 IO card. (which can pass enough current for the contactor coil) To close the main contactor the PC has to agree that it is allowed, and the E-stop buttons have to be out. The e-stop buttons also have an NO contact (completely separate from the 24V contactor circuit) which informs the PC that an e-stop is pressed, and operates the software e-stop too. This is important on my machine as the DC power supply needs to be allowed to bleed down to zero volts before being turned back on again (or the bleed-down relay explodes..), so I have a timer in HAL on the machine enable button. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ Free Next-Gen Firewall Hardware Offer Buy your Sophos next-gen firewall before the end March 2013 and get the hardware for free! Learn more. http://p.sf.net/sfu/sophos-d2d-feb _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
